CN100493023C - Method for implementing multimedia communication systems intercommunication - Google Patents
Method for implementing multimedia communication systems intercommunication Download PDFInfo
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- CN100493023C CN100493023C CN 200610111282 CN200610111282A CN100493023C CN 100493023 C CN100493023 C CN 100493023C CN 200610111282 CN200610111282 CN 200610111282 CN 200610111282 A CN200610111282 A CN 200610111282A CN 100493023 C CN100493023 C CN 100493023C
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Abstract
This invention discloses a method for realizing intercommunication of multimedia communication sytem including: after a medium process device finishes H.245 negotiation with a terminal of the H.245, it reports to a medium control device information of opening a logic channel containing information of logic channel directions, the control device identifies that the opened logic channel is for sending or receiving and instructs the process device to modify the mapping relation of the loigic channel of the H.245 and media flows of the other side to realize intercommunication.
Description
Technical field
The present invention relates to the multimedia communication systems intercommunication technology, refer to a kind of method that realizes multimedia communication systems intercommunication especially, H.245 at least one side adopts agreement that Media Stream is controlled in the multimedia system of intercommunication.
Background technology
Multimedia communications system is meant can provide Multimedia session, as the network system of audio frequency and video communication.There is multiple multimedia communications system at present, such as: the H.324 network that H.324, H.245, H.223 waits agreement adopted; Adopt H.323 agreement, H.225.0 agreement, the H.323 network of agreement, RTP/RTCP Real-time Transport Control Protocol (RTP/RTCP) etc. H.245; Adopt the IP Multimedia System (IMS) of session initiation protocol (SIP), Session Description Protocol (SDP), RTP/RTCP etc. etc.
This paper is the multimedia interconnection scene that adopts agreement H.245 that Media Stream is controlled at have a side at least in the multimedia system of intercommunication, such as H.324 with the SIP network interworking, H.323 with the SIP network interworking, H.324 with H.323 network interworking etc.Abbreviate a side that adopts agreement H.245 that Media Stream is controlled in the multimedia interconnection as H.245 side in the literary composition.
Intercommunication between the different multimedia communication system need realize the intercommunication of signaling and Media Stream, is generally cooperated by medium control device under the separation architecture and medium processing device and finishes.Wherein, medium control device is finished and is called out control, realizes the intercommunication of signaling, and indication medium processing device operation media resource; Medium processing device provides media resource, and operates media resource according to the indication of medium control device, realizes the intercommunication of Media Stream.Carry out alternately as agreement H.248 by the medium control protocol between medium control device and the medium processing device.
H.324/H.323 wait the system that adopts agreement H.245 that Media Stream is controlled, during with other multimedia communication systems intercommunication, H.245 can terminate on the medium control device H.245 message of i.e. all receptions and transmission of agreement is all handled by medium control device, also can on medium processing device, terminate the situation that this paper terminates on medium processing device at agreement H.245.
Need to prove, medium control device and medium processing device are general names herein, include but not limited to the Mobile Switching Center Server (MSC in Media Gateway Controller (MGC) in the next generation network (NGN) and media gateway (MGW), Wideband Code Division Multiple Access (WCDMA) (WCDMA) network
Server) and media resource function control (MRFC) entity and media resource function in MGCF (MGCF) entity in the media gateway (MGW), IMS network and IP multimedia-media gateway (IM-MGW), the IMS network handle (MRFP) entity etc.
Fig. 1 be prior art to be the schematic network structure of example H.324 with the SIP network interworking, among Fig. 1, dotted line is represented signaling, solid line presentation medium stream; The left side of single-point line is called H.245 side, comprises H.324 terminal and circuit domain (CS) network; The right side of double dot dash line is called the SIP side, comprises sip terminal and SIP communication network, and the SIP communication network can be a fixed network of supporting the SIP multimedia call, also can be the IMS network.
In the interworking architecture shown in Figure 1, realize that H.324 the method for network and SIP network interworking is:
At first, finish H.245 side call setup, H.245 the side carrying is set up; SIP side call setup is determined the encoding and decoding of SIP side, and the carrying of SIP side is set up, and revises SIP side Media Stream attribute.In SIP side call establishment, consult the code/decode type of definite SIP side by the chain of command signaling, the carrying that medium control device indication medium processing device is set up the SIP side; And in side H.245, code/decode type can not be consulted by the signaling of chain of command, can only be after H.245 the side carrying be set up, medium processing device with H.324 between the terminal by with in the negotiation of H.245 signaling finish.
Then, medium processing device and H.324 the H.245 negotiations process between the terminal be: at first carry out capability set exchange and principal and subordinate and determine, the ability of intercommunication opposite end is obtained in the exchange of handling capacity collection, comprise multiplexing capacity, receive the ability of the various code/decode type medium of transmission etc., so that when opening logical channel, select suitable encoding and decoding, multiplexing parameters etc.; End by principal and subordinate's decision process decision intercommunication is main (Master), and the other end is from (Slave), like this, when clashing in the calling procedure, is as the criterion according to the selection of Master; Afterwards, finish and open logical channel and multi-meter process of transmitting, logical channel and Media Stream are corresponding one by one, open the logical channel process and determined the H.245 final code/decode type of selecting of side and the direction of Media Stream, and the multi-meter process of transmitting be with the local terminal Media Stream and H.245 signaling how to generate the rule notice opposite end of multiplex stream H.223, the opposite end can be independently Media Stream and H.245 signaling with the H.223 multiplex stream demultiplexing of receiving like this.H.245 the specific implementation of negotiations process can no longer describe in detail here referring to related protocol.
Medium processing device must will be opened the logical channel object information and report medium control device after opening the end of logical channel process.Medium processing device carries logical channel number (LCN) and the code/decode type of opening in reported result information, the information that medium control device reports according to medium processing device, the indication medium processing device is revised the H.245 mapping relations between the side logical channel and SIP side Media Stream, be that audio logical channel is corresponding with the audio stream of SIP side, the video logic passage is corresponding with the video logic passage of SIP side.So far, calling both sides enters the multimedia speech phase, realizes intercommunication.
According to the logical channel that defines in the agreement H.245, can be unidirectional also can be two-way, communicating pair can adopt a pair of one-way logical channel communication, also can adopt a bi-directional logical channel communication.One-way logical channel has only a forward direction logical channel number (LCN) as sign, and bi-directional logical channel is represented by a forward direction logical channel number (LCN) and a reverse logic channel number.No matter be one-way logical channel or bi-directional logical channel, the logical channel number (LCN) of reception and sending direction all is fully independently, can be identical, and also can be inequality.
At present, if H.245 the logical channel number (LCN) difference of side transmit-receive position or code/decode type difference, medium control device can only be considered as both direction identical the processing.
For example the logical channel of H.324 opening between terminal and the medium processing device is: terminal-medium processing device direction H.324, and logical channel number (LCN) 1 adopts H.261 encoding and decoding; The terminal direction of medium processing device-H.324, logical channel number (LCN) 2, adopt H.263 encoding and decoding, if medium processing device reports logical channel number (LCN) 1 and H.261 encoding and decoding, so medium control device can indicate Media Stream that medium processing device will receive from the SIP side joint and medium processing device～H.324 the logical channel 1 of terminal direction associate, and in fact medium processing device-H.324 the terminal direction has only logical channel 2, and terminal can't receive Media Stream thereby cause H.324.Similarly, if medium processing device reports logical channel number (LCN) 2 and H.263 encoding and decoding, so, sip terminal can't receive Media Stream.If medium processing device reports logical channel number (LCN) 1 and H.261 encoding and decoding, logical channel number (LCN) 2 and H.263 encoding and decoding, medium control device can not identify logical channel 1 and logical channel 2 is a pair of half-duplex channels, therefore, the Media Stream that can only will receive from the SIP side joint according to the up-to-date logical channel number (LCN) of receiving and code/decode type indication medium processing device of medium control device and medium processing device-H.324 the up-to-date logical channel of terminal direction associates.
Method from above-mentioned H.324 network and SIP network interworking, if H.245 the logical channel number (LCN) difference of side transmit-receive position or code/decode type difference, medium control device can not correctly indicate medium processing device to revise the H.245 mapping relations between the side logical channel and opposite side Media Stream, make call failure, thereby caused the failure of multimedia system intercommunication.
In addition, H.248.12 stipulating in the agreement, in the multimedia communication systems intercommunication process, medium processing device reports the method for closing logical channel process result to medium control device, on give the correct time and do not carry the information of any relevant logical channel, medium control device can only be considered as all logical channels and close and indicate medium processing device to close all logical channels.But, in actual Multimedia session process, audio logical channel or video logic passage need be closed separately, even the logical channel of a direction can be only closed, for example only close the video logic passage of sending direction.Close the method for logical channel in the existing intercommunication process, can not realize the user in the multimedia communication process, to specifying closing of logical channel.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method that realizes multimedia communication systems intercommunication, can be in the multimedia system of intercommunication at least one side be to adopt under the intercommunication sight that agreement H.245 controls Media Stream, guarantee the successful realization of intercommunication.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of method that realizes multimedia communication systems intercommunication is to adopt under the intercommunication sight of the H.245 side that agreement H.245 controls Media Stream at least one side, and this method comprises:
A. after medium processing device and the terminal of side are H.245 finished and H.245 consulted, report the logical channel information of opening that includes logical channel directional information, logical channel number (LCN) information and codec type information to medium control device;
B. medium control device is according to the logical channel information of opening that receives, identify the logical channel direction of opening and be reception or transmission, and the indication medium processing device revises the H.245 mapping relations between the side logical channel and intercommunication opposite side Media Stream, realizes intercommunication.
If the terminal use of described H.245 side closes the appointment logical channel, this method also comprises:
Described medium processing device is closed the appointment logical channel, and the logical channel number (LCN) of the logical channel of appointment and logical channel direction be carried to close report described medium control device in the logical channel information;
Described medium control device is according to the logical channel information of closing that receives, and the indication medium processing device is controlled the Media Stream of the opposite side of the logical channel correspondence of appointment.
The described logical channel information of closing is carried by extended medium control protocol bag.
H.248, described medium control protocol bag is when wrapping, and this method also comprises: expansion is used to carry described H.245 pathway closure incident of closing logical channel information in bag H.248.
Described H.245 pathway closure incident comprises at least: be used to carry the logical channel number (LCN) parameter of logical channel number (LCN) information, and be used to carry the directioin parameter of logical channel direction.
The Media Stream of the opposite side of described logical channel correspondence to appointment is controlled and is comprised: only receives, or only sends, or deexcitation.
If the terminal use of described H.245 side opens the appointment logical channel, this method also comprises:
Described medium processing device is opened the appointment logical channel, and the information of the logical channel that appointment is opened is carried to open and reports described medium control device in the logical channel information;
Described medium control device is according to the logical channel information of opening that receives, and the indication medium processing device is controlled the Media Stream of the opposite side of the logical channel correspondence of appointment.
The described logical channel information of opening is carried by extended medium control protocol bag.
H.248, described medium control protocol bag is when wrapping, and this method also comprises: increase in bag H.248 and be used to carry the described H.245 passage of opening logical channel information and open incident.
Described H.245 passage is opened incident and is comprised at least: be used to carry logical channel number (LCN) information the logical channel number (LCN) parameter, be used to carry the directioin parameter of logical channel direction, and be used to carry the code/decode type parameter of code/decode type.
The Media Stream of the opposite side of described logical channel correspondence to appointment is controlled and is comprised: only receive, or only send, or receive simultaneously and send.
Described H.245 agreement terminates on medium processing device.
Described medium processing device is: media gateway MGW, or IP multimedia-media gateway IM-MGW, or media resource function is handled the MRFP entity;
Described medium control device is: media gateway controller MGC, or mobile switching center server MSC Server, or MGCF MGCF entity, or media resource function control MRFC entity.
As seen from the above technical solution, the present invention's at least one side in the multimedia system of intercommunication is to adopt under the intercommunication sight that agreement H.245 controls Media Stream, after medium processing device and the terminal of side are H.245 finished and are H.245 consulted, report the logical channel information of opening that includes the logical channel directional information to medium control device, medium control device is according to the logical channel information of opening that receives, identify the logical channel direction of opening and be reception or transmission, and the indication medium processing device revises the H.245 mapping relations between the side logical channel and intercommunication opposite side Media Stream, thereby realizes intercommunication.From the inventive method as seen, at medium processing device to opening in the logical channel information that medium control device reports, owing to include the logical channel directional information, medium control device has identified the logical channel of opening and has been used for receiving or sending, correctly indicate medium processing device to revise the H.245 mapping relations between the side logical channel and intercommunication opposite side Media Stream, thereby guaranteed the successful realization of intercommunication.
Description of drawings
Fig. 1 be prior art H.324 with the schematic network structure of SIP network interworking;
Fig. 2 be the present invention H.324 with the flow chart of the embodiment of SIP network interworking;
Fig. 3 is that H.324 with among the embodiment of SIP network interworking the present invention opens the schematic diagram of logical channel;
Fig. 4 is that H.324 with among the embodiment of SIP network interworking the present invention closes the schematic diagram of logical channel;
Fig. 5 is that H.324 with among the embodiment of SIP network interworking the present invention reopens the schematic diagram of logical channel.
Embodiment
Core concept of the present invention is: at least one side is to adopt under the intercommunication sight that H.245 agreement is controlled Media Stream, after medium processing device and the terminal of side are H.245 finished and are H.245 consulted, report the logical channel information of opening that includes the logical channel directional information to medium control device, medium control device is according to the logical channel information of opening that receives, identify the logical channel direction of opening and be reception or transmission, and the indication medium processing device revises the H.245 mapping relations between the side logical channel and intercommunication opposite side Media Stream, realizes intercommunication.
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing preferred embodiment that develops simultaneously, the present invention is described in more detail.
Because the intercommunication scene is a lot of between multimedia communications system, call flow differs greatly, and the invention among the present invention is irrelevant with concrete application scenarios, needs only to have at least a side to adopt H.245 agreement that Media Stream is controlled in the multimedia system of intercommunication.To be the example explanation H.324, specifically describe the realization of the inventive method below with the SIP network interworking.
Fig. 2 be the present invention H.324 with the flow chart of the embodiment of SIP network interworking, suppose that H.245 side is called out to set up that H.245 the side carrying is set up; The SIP side is called out and is set up, and determines the encoding and decoding of SIP side, and the carrying of SIP side is set up, and has revised SIP side Media Stream attribute, may further comprise the steps:
Step 200:H.324 terminal and medium processing device carry out H.245 negotiations process.
The realization and the prior art of this step are in full accord, can repeat no more here referring to related protocol.
Step 201: medium processing device reports the logical channel information of opening to medium control device, and this information includes logical channel number (LCN), code/decode type and logical channel direction.
The logical channel direction signs counterlogic passage be to receive or send.
Usually, under the separation architecture, medium processing device to medium control device report open logical channel information can by extended medium control protocol bag as H.248 the bag realize.H.248 agreement is the agreement that is specifically designed to media resource control under the separation architecture of ITU-T definition.H.248 the basic principle of agreement is: abstract in terminal the various resources on the medium processing device, terminal is divided into physical terminal and ephemeral terminations again.Physical terminal is represented some physical entities with semipermanent existence, as the Time Division Multiplexing time slot; The public resource that on behalf of provisional application, ephemeral terminations use the back to discharge is as rtp streaming.Combination between the terminal is conceptualized as context, with the topological relation of describing between the terminal.Abstract based on these, call proceeding is actually terminal and contextual operation, finishes by command request between medium control device and the medium processing device and response, and order comprises increase, modification, deletion, notice etc.; Command parameter is called descriptor, is categorized as attribute (Property), signal (Signal), incident (Event), statistics (Statistic), and the parameter with professional correlation is polymerized to a bag (Package) in logic.H.248 agreement increases new function by wrapping the function of Extended Protocol in agreement, does not generally need to revise the agreement body, gets final product and only need define new bag.A bag can be regarded the encapsulation of an autonomous behavior as, when medium processing device is claimed this bag of support, also just equal medium processing device and support this characteristic, medium control device just can use attribute, incident, signal, the statistics of definition in this bag, operate the media resource on the medium processing device, realize the corresponding service logic.
In this step, in existing H.248 bag, increase by one H.245 passage open (H.245 ChannelOpened) incident, be used to report and H.245 open logical channel information, this H.245 passage open incident and comprise three parameters at least: logical channel number (LCN), direction are logical channel direction and code/decode type, specifically describe as follows:
Incident title (Event Name): as Channel Opened H.245;
Event identifier (EventID): as h245ChO (0x0003);
Describe (Description): expression is when medium processing device is opened a logical channel, and this incident takes place;
Event descriptor parameter (Events Descriptor Parameters): do not have;
The observed event descriptor parameter of Observed Events Descriptor Paramete rs:():
Logical channel number (LCN) (Logical Channel Number)
Parameter name (Parameter Name): Logical Channel Number;
Parameter I D (ParameterID): being used to identify this parameter is logical channel number (LCN), as 1cn (0x0003)
Description: be used to indicate logical channel number (LCN);
Type (Type): the data type of presentation logic channel number can be integer (Integer) here;
Optional (Optional): No presentation logic channel number is a mandatory parameter;
Probable value (Possible values): scope is 1 to 65535;
Default value (Default): do not have;
Direction (Direction)
Parameter?Name：Direction；
ParameterID: being used to identify this parameter is direction, as dir (0x0004);
Description: the direction that is used for indicating the logical channel Media Stream;
Type (Type): enumeration type (Enumeration);
Optional：No；
Probable value (Possible values): can be receive direction with Incoming (0x0000) presentation logic passage; Outgoing (0x0001) presentation logic passage is a sending direction;
Default value (Default): do not have;
Code/decode type (Encoding Name)
Parameter?Name：Encoding?Name；
ParameterID: being used to identify this parameter is code/decode type, as en (0x0005);
Description: the code/decode type that is used for indicating the employing of logical channel Media Stream;
Type: byte serial (Octet String);
Optional：No；
Possible values: the same form of title (encoding name) of encoding among employing and the SDP;
Default: do not have.
Step 202: medium control device identifies the logical channel direction of opening and is reception or transmission according to the information that medium processing device reports.
In this step, medium control device is opened in the incident according to the H.245 passage that receives, the value of directioin parameter, and the logical channel that identification is opened is for receiving or sending.
Step 203: the indication medium processing device is revised the H.245 mapping relations between the side logical channel and SIP side Media Stream, and promptly audio logical channel is corresponding with the audio stream of SIP side, and the video logic passage is corresponding with the video logic passage of SIP side.So far, the intercommunication both sides enter the multimedia speech phase, realize intercommunication.
Unlike the prior art be, because in the inventive method, medium processing device includes the logical channel direction to opening of reporting of medium control device in the logical channel information, like this, medium control device can be according to the logical channel directional information, at logical channel number (LCN) not simultaneously, the logical channel that identifies corresponding Different Logic channel number is respectively applied for and receives and send, and sending and receiving is a pair of unidirectional Media Stream; In the code/decode type difference, the logical channel that identifies corresponding code/decode type is that the expression reception is different with the code/decode type that sends employing; At logical channel number (LCN) and code/decode type all not simultaneously, the logical channel that identifies corresponding Different Logic channel number is respectively applied for and receives and send, and sending and receiving is a pair of unidirectional Media Stream, and sends with receiving and adopt different code encoding/decoding modes.
Like this, medium control device could correctly be indicated the mapping relations between medium processing device modification logical channel and the opposite side Media Stream, thereby successfully realize intercommunication according to the information that identifies.
From the invention described above method as seen, at medium processing device to opening in the logical channel information that medium control device reports, owing to include the logical channel directional information, medium control device has identified the logical channel of opening and has been used for receiving or sending, correctly indicate medium processing device to revise the H.245 mapping relations between the side logical channel and intercommunication opposite side Media Stream, thereby guaranteed the successful realization of intercommunication.
Further, after the intercommunication both sides enter the multimedia speech phase, if H.324 the terminal use need close the Media Stream logical channel of appointment, so, stipulate according to existing protocol, medium processing device with terminal H.324 finish close the logical channel process after, can will close logical channel information and report medium control device, with existing different be, in the inventive method, medium processing device is carried at logical channel number (LCN) and logical channel direction to close in the logical channel information and reports medium control device, medium control device can be according to closing the logical channel number (LCN) and the logical channel direction of carrying in the logical channel information like this, and the indication medium processing device is controlled the Media Stream of the opposite side of the logical channel correspondence of appointment, receives only such as changing into, or only send, or deexcitation etc.
In order to report closing passage information, the present invention expands H.245 pathway closure (the H.245 Channel Closed) incident in the existing H.248 bag, the pathway closure incident can be reported H.245 close logical channel information, this H.245 the pathway closure incident comprise two parameters at least: logical channel number (LCN) and direction are the logical channel direction, specifically describe as follows:
Event?Name：H.245?Channel?Closed；
EventID: as h245ChC (0x0002);
Description: when medium processing device was closed a logical channel, this incident took place;
Events Descriptor Parameters: do not have;
Observed?Events?Descriptor?Parameters：
Logical?Channel?Number
Parameter?Name：Logical?Channel?Number；
ParameterID: as lcn (0x0003);
Description; : be used to indicate logical channel number (LCN);
Type：Integer；
Optional：No；
Possible values:1 to 65535;
Default: do not have;
Direction
Parameter?Name：Direction；
ParameterID: as dir (0x0004);
Description: the direction of indication logical channel;
Type：Enumeration；
Optional：No；
Possible values: can be that receive direction, Outgoing (0x0001) presentation logic passage are sending direction with Incoming (0x0000) presentation logic passage;
Default: do not have.
Need to prove, defined H.245 pathway closure incident in the existing protocol, but the H.245 pathway closure incident in the existing protocol can only report closing information, and H.245 not carrying logical channel number (LCN) and direction in the pathway closure incident is two parameters of logical channel direction.
Further, after the intercommunication both sides enter the multimedia speech phase, if H.324 the terminal use need open the Media Stream logical channel of appointment, so, stipulate according to existing protocol, medium processing device with terminal H.324 finish open the logical channel process after, the logical channel information of opening that can will carry logical channel number (LCN) and code/decode type reports medium control device, find out easily, medium control device can not correctly indicate medium processing device to revise the H.245 mapping relations between the side logical channel and opposite side Media Stream, make call failure, thereby caused the failure of multimedia system intercommunication.In order to overcome this defective, in the inventive method, the logical channel information of opening that medium processing device will include the logical channel directional information reports medium control device, medium control device can be according to the logical channel information of opening that receives, the indication medium processing device is controlled the Media Stream of the opposite side of the logical channel correspondence of appointment, receive only such as changing into, or only send, or receive simultaneously and transmission etc.
Below in conjunction with several embodiment, contrast the present invention and the existing method that realizes intercommunication.The terminal of supposing to adopt the side that agreement H.245 controls Media Stream in the multimedia system of intercommunication is terminal H.324, and another is surveyed and is the SIP communication network, and terminal is a sip terminal, and medium processing device is MGW, and medium control device is MGC; In addition, because H.324 the video capability of terminal is asymmetric, H.324 the side transmit-receive position adopts different coding and decoding video types.
Fig. 3 is that H.324 with among the embodiment of SIP network interworking the present invention opens the schematic diagram of logical channel, and as shown in Figure 3, after supposing H.245 to consult to finish, MGW opens logical channel 2, and H.263 the sending direction of logical channel 2 adopts encoding and decoding; H.261 the receive direction of logical channel 2 adopts encoding and decoding; H.263 the sip terminal video flowing adopts encoding and decoding.
H.261 MGW according to existing method, no matter H.263 MGW reports logical channel number (LCN) 2, encoding and decoding, still reports logical channel number (LCN) 2, encoding and decoding after opening the end of logical channel process, all can cause a direction video obstructed.
And employing the inventive method, MGW comprises to the logical channel information of opening that MGC reports: logical channel number (LCN) 2, encoding and decoding H.263, sending direction; Logical channel number (LCN) 2, encoding and decoding H.261, receive direction, after MGC receives the information that MGW reports, identify logical channel 2 and have both direction, therein on direction, indication MGW carries out unidirectional coding and decoding video conversion, to be converted to H.263 from the H.261 video flowing that terminal H.324 receives, video flowing sends to sip terminal, on another direction, indication MGW will receive from sip terminal H.263 video flowing pass through H.324 terminal, the inventive method has guaranteed that the video communication of both direction can both normally carry out.
Fig. 4 is that H.324 with among the embodiment of SIP network interworking the present invention opens the schematic diagram of logical channel, on basis shown in Figure 3, in the multimedia communication process, suppose that terminal use H.324 closes the video (is exactly the receive direction of logical channel 2 for MGW) of sending direction.
H.324 terminal initiates to close the logical channel process, close the video logic passage 2 of terminal H.324 to the MGW direction, after closing the end of logical channel process, according to existing method, MGW only just needs to close as closing logical channel information and reports MGC, and not carrying the information of any logical channel, medium control device can only be considered as all logical channels and close and indicate medium processing device to close all logical channels.
And employing the inventive method, MGW carries logical channel number (LCN) to closing of reporting of MGC in the logical channel information be logical channel 2, and to indicate what close be the directional information of the receive direction of logical channel 2, like this, MGC closes the receive direction of logical channel 2, and indication MGW changes the Media Stream of SIP side into unidirectional, promptly only allows Media Stream to be sent to MGW from sip terminal, as shown in Figure 4.
Fig. 5 is that H.324 with among the embodiment of SIP network interworking the present invention reopens the schematic diagram of logical channel, on basis shown in Figure 4, in the multimedia communication process, suppose that H.324 the terminal use need open the video (is exactly receive direction for MGW) of sending direction, so that send video flowing to sip terminal.
H.324 terminal initiates to open the passage process, open the video logic passage of terminal H.324 to the MGW direction, the logic of propositions channel number is 3, code/decode type still for encoding and decoding H.261, as shown in Figure 5, at this moment, the logical channel number (LCN) of the logical channel of video flowing transmit-receive position is all different with code/decode type, according to existing method, MGW can't indicate this situation to MGC.
And employing the inventive method, MGW can with carry logical channel number (LCN) be logical channel 3, code/decode type be encoding and decoding H.261, and the logical channel direction is that the logical channel information of opening of receive direction reports MGC, like this, MGC can open information according to the logical channel that receives and open logical channel 3 and this logical channel 3 for adopting the receive path of H.261 encoding and decoding, and indication MGW recovers (changing into) for two-way with the Media Stream of SIP side.
As seen, by the inventive method, medium processing device has realized very neatly in the intercommunication process under the various situations that H.245 the logical channel information of opening, close of side Media Stream logical channel reports MGC, so that MGC carries out correct subsequent processes.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. method that realizes multimedia communication systems intercommunication is to adopt under the intercommunication sight of the H.245 side that agreement H.245 controls Media Stream at least one side, it is characterized in that this method comprises:
A. after medium processing device and the terminal of side are H.245 finished and H.245 consulted, report the logical channel information of opening that includes logical channel directional information, logical channel number (LCN) information and codec type information to medium control device;
B. medium control device is according to the logical channel information of opening that receives, identify the logical channel direction of opening and be reception or transmission, and the indication medium processing device revises the H.245 mapping relations between the side logical channel and intercommunication opposite side Media Stream, realizes intercommunication.
2. method according to claim 1 is characterized in that, if the terminal use of described H.245 side closes the appointment logical channel, this method also comprises:
Described medium processing device is closed the appointment logical channel, and the logical channel number (LCN) of the logical channel of appointment and logical channel direction be carried to close report described medium control device in the logical channel information;
Described medium control device is according to the logical channel information of closing that receives, and the indication medium processing device is controlled the Media Stream of the opposite side of the logical channel correspondence of appointment.
3. method according to claim 2 is characterized in that, the described logical channel information of closing is carried by extended medium control protocol bag.
4. method according to claim 3 is characterized in that, H.248 described medium control protocol bag when wrapping, and this method also comprises: expansion is used to carry described H.245 pathway closure incident of closing logical channel information in bag H.248.
5. method according to claim 4 is characterized in that, described H.245 pathway closure incident comprises at least: be used to carry the logical channel number (LCN) parameter of logical channel number (LCN) information, and be used to carry the directioin parameter of logical channel direction.
6. method according to claim 2 is characterized in that, the Media Stream of the opposite side of described logical channel correspondence to appointment is controlled and comprised: only receive, or only send, or deexcitation.
7. method according to claim 1 and 2 is characterized in that, if the terminal use of described H.245 side opens the appointment logical channel, this method also comprises:
Described medium processing device is opened the appointment logical channel, and the information of the logical channel that appointment is opened is carried to open and reports described medium control device in the logical channel information;
Described medium control device is according to the logical channel information of opening that receives, and the indication medium processing device is controlled the Media Stream of the opposite side of the logical channel correspondence of appointment.
8. method according to claim 7 is characterized in that, the described logical channel information of opening is carried by extended medium control protocol bag.
9. method according to claim 8 is characterized in that, H.248 described medium control protocol bag when wrapping, and this method also comprises: increase in bag H.248 and be used to carry the described H.245 passage of opening logical channel information and open incident.
10. method according to claim 9, it is characterized in that, described H.245 passage is opened incident and is comprised at least: be used to carry logical channel number (LCN) information the logical channel number (LCN) parameter, be used to carry the directioin parameter of logical channel direction, and be used to carry the code/decode type parameter of code/decode type.
11. method according to claim 7 is characterized in that, the Media Stream of the opposite side of described logical channel correspondence to appointment is controlled and is comprised: only receive, or only send, or receive simultaneously and send.
12. method according to claim 1 is characterized in that, described H.245 agreement terminates on medium processing device.
13. method according to claim 1 is characterized in that, described medium processing device is: media gateway MGW, or IP multimedia-media gateway IM-MGW, or media resource function is handled the MRFP entity;
Described medium control device is: media gateway controller MGC, or mobile switching center server MSC Server, or MGCF MGCF entity, or media resource function control MRFC entity.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610111282 CN100493023C (en) | 2006-08-21 | 2006-08-21 | Method for implementing multimedia communication systems intercommunication |
| PCT/CN2007/070388 WO2008025271A1 (en) | 2006-08-21 | 2007-07-31 | Method, system and device to achieve intercommunication of a multimedia communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610111282 CN100493023C (en) | 2006-08-21 | 2006-08-21 | Method for implementing multimedia communication systems intercommunication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101132339A CN101132339A (en) | 2008-02-27 |
| CN100493023C true CN100493023C (en) | 2009-05-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610111282 Expired - Fee Related CN100493023C (en) | 2006-08-21 | 2006-08-21 | Method for implementing multimedia communication systems intercommunication |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100493023C (en) |
| WO (1) | WO2008025271A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108881139A (en) * | 2017-10-30 | 2018-11-23 | 北京视联动力国际信息技术有限公司 | A kind of method and apparatus of video communication |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1158819C (en) * | 1999-07-12 | 2004-07-21 | 艾利森电话股份有限公司 | Method and system for exchanging information between multimedia network nodes |
| JP2002084363A (en) * | 2000-09-06 | 2002-03-22 | Nec Corp | Gateway system and line control method used therefor |
| CN1281058C (en) * | 2002-08-08 | 2006-10-18 | 中兴通讯股份有限公司 | Method and device for distributive meeting TV deputy server |
-
2006
- 2006-08-21 CN CN 200610111282 patent/CN100493023C/en not_active Expired - Fee Related
-
2007
- 2007-07-31 WO PCT/CN2007/070388 patent/WO2008025271A1/en active Application Filing
Non-Patent Citations (2)
| Title |
|---|
| 软交换信令网关实现技术的探索. 秦维，严伟，王栋.计算机应用，第Vol.25卷第No.3期. 2005 |
| 软交换信令网关实现技术的探索. 秦维，严伟，王栋.计算机应用，第Vol.25卷第No.3期. 2005 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008025271A1 (en) | 2008-03-06 |
| CN101132339A (en) | 2008-02-27 |
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